CN104937442A - Downhole electromagnetic telemetry system utilizing electrically insulating material and related methods - Google Patents
Downhole electromagnetic telemetry system utilizing electrically insulating material and related methods Download PDFInfo
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- CN104937442A CN104937442A CN201280077739.1A CN201280077739A CN104937442A CN 104937442 A CN104937442 A CN 104937442A CN 201280077739 A CN201280077739 A CN 201280077739A CN 104937442 A CN104937442 A CN 104937442A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
- E21B47/16—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the drill string or casing, e.g. by torsional acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
Abstract
The invention relates to a downhole electromagnetic telemetry system and method whereby electrically insulating material is placed above and/or below an electrical current launching device or receiver along a well string in order to extend the range of the telemetry system, increase the telemetry rate, and/or reduce downhole power requirements.
Description
Invention field
The present invention relates generally to em telemetry, and more particularly relate to a kind of downhole telemetry system, wherein electrically insulating material is placed on one or more portion of well post to expand the scope of described telemetry system, increases remote measurement speed, and/or reduces down-hole power requirement.
Technical background
For various purposes, electromagnetic remote metering system in downhole operations for transmitting and receiving electromagnetic signal.The drill collar section that em telemetry transmitter receives drilling rod by bridging transmits potential difference or passes through to be transmitted in drilling rod by electric signal via the toroid winding be placed on around drill string section transmitter current on drill string.
But when electromagnetic launcher is in sleeve pipe, part signal too much, this is because the current jump on drilling rod is to sleeve pipe, therefore may be transmitted into sleeve pipe by the loss of signal, and makes part signal along cover tube short circuit.In addition and especially when drilling rod any part with exist between sleeve pipe directly contact time, the motion of drill string can cause discontinuous connection, and is therefore introduced in telesignalisation by very large noise.In addition, because signal moves above or below drilling rod and/or sleeve pipe, so it is decayed in fact along with in the stratum near current leakage to boring.Therefore, the signal received on earth's surface or underground receiver place can decay to the point carrying out reliable communication under wherein signal to noise ratio (S/N ratio) is not high enough to the data rate of permission even at several per second.
In view of aforementioned, need a kind of cost-effective method in the art, by the scope of described method easily extensible telemetry system and/or prevent from being then short-circuited in sleeve pipe in sleeve pipe or directly by mud..
Accompanying drawing is sketched
Figure 1A and 1B illustrates rig according to one or more exemplary of the present invention and electromagnetic remote metering system 10; With
Fig. 2 A, 2B and 2C be illustrate according to one or more exemplary of the present invention above current emission device and/or below add the chart that the signal of electrically insulating material improves effect.
Embodiment
Hereafter describe as illustrative embodiment of the present invention and the correlation technique that wherein electrically insulating material is placed on the downhole telemetry system of one or more portion of well post may be used for.For the sake of clarity, all features of actual embodiment or method are not described in this manual.In addition, " exemplary " embodiment described herein refers to example of the present invention.Certainly, should understand, in the exploitation of any this actual embodiment, the concrete decision-making of many embodiments must be made to realize developer's specific purposes of will change with embodiment, such as the compatibility with business related constraint relevant to system.In addition, should understand, this development may be complicated and consuming time, but will be normal work to do concerning the general personnel having benefited from art of the present disclosure.In view of hereafter describing and accompanying drawing, other aspect and the advantage of various embodiments of the present invention and correlation technique will become apparent.
As described in this article, when electromagnetic remote metering system the sleeve section of well or without in sleeve section time, exemplary of the present invention expands the scope of described system.In order to achieve this end, electrically insulating material is put on well post with immediately preceding above current emission device (such as, insulating short section assembly or toroid winding) or receiver and/or below.In other embodiments, electrically insulating material can also cover current emission device or receiver.Therefore, along with electric signal is transmitted in drilling rod by current emission device, electrically insulating material prevents electric current from directly or by drilling mud jumping to sleeve pipe, therefore prevent or be reduced in when its middle sleeve is not present in around transmitter by the short circuit of sleeve pipe and/or the seriousness to the current leakage in stratum, thus improve scope and/or the signal to noise ratio (S/N ratio) of telemetry system, and/or reduce the desired electric power of system.In addition, utilize wherein in the embodiment of underground receiver, electrically insulating material is for reducing during downlink operation from well post to the current leakage on sleeve pipe or stratum.
In some exemplary, electrically insulating material is the one or more thin slices using adhesive backing to be wrapped in the material around bottom hole assembly or drilling rod.In other embodiments, such as, electrical isolation expandable material or various coating can also be utilized.Therefore, to have and the scope of electromagnetic remote metering system without sleeve section increases haply and reaches same electrical insulation drilling rod amount.Therefore, can also increase electromagnetic remote metering system data rate and without the need to adding repeater.
Figure 1A and 1B illustrates rig 12 according to one or more exemplary of the present invention and electromagnetic remote metering system 10.As in the art understand, electromagnetic remote metering system 10 down-hole generate and/or receive electromagnetic wave.Electromagnetic remote metering system 10 comprises bottom hole assembly 14, current emission device 16 (such as, insulating short section assembly) and pipe section 18 (such as, its combination is called well post), and all said apparatus extend through the sleeve pipe 20 of well 22 downwards.As used herein, term " well post " can refer to various deployment post, for example, and such as drill string, coiled tubing, production tubing etc.In the exemplary of Figure 1A and 1B, well post is drill string.
In addition, electromagnetic remote metering system 10 comprises the receiver 24 being electrically coupled to ground reference system 26, and can also have one or more repeater (not shown) along pipeline 18 if desired.Generally, electromagnetic remote metering system 10 communicates by launching low-frequency current (such as, between about between 1 with 30Hz) along pipeline 18.Then detected the signal be associated with electric current by receiver 24 on earth's surface, wherein measure the potential difference between rig 12 and ground 26.Should be appreciated that as having benefited from personnel art of the present disclosure, in this exemplary, electromagnetic remote metering system 10 can operate by such as phase modulated carrier signal pattern, pulse-position modulation pattern or OFDM pattern or other modulating mode multiple.
In order to produce the electric current launched by electromagnetic remote metering system 10, current emission device 16 is provided near bottom hole assembly 14 (maybe can form the part of bottom hole assembly 14).In the first exemplary, the electrical circuit breakers that current emission device 16 is provided as between bottom hole assembly 14 and pipeline 18 enters in large-scale antenna effectively to make well post.In the exemplary of Figure 1A, insulating short section assembly is used as electrical circuit breakers or antenna.Thus, between bottom hole assembly 14 and pipeline 18, produce electric potential difference, therefore produce the electric current of transmitting.As in the art understand, insulating short section assembly be the height being designed to bear electromagnetic remote metering system 10 reverse, bending, can the electrical isolation joint of Tension and Compression load.But, as in the art understand, in other embodiments, current emission device 16 is alternately toroid winding assembly.The general personnel having benefited from art of the present disclosure will easily understand these and other aspect of electromagnetic remote metering system 10.
Still with reference to Figure 1A and 1B, pipeline 18 has descended through preventer 28 down in well 22, and by sleeve pipe 20.As described previously, in this exemplary, pipeline 18 is the drilling rod of the part forming drill string; But in other embodiments, pipeline 18 can be such as coiled tubing or the production tubing of some other operations.But pipeline 18 expands to current emission device 16 downwards to be coupled to bottom hole assembly 14.Drill bit 30 is positioned at the far-end of bottom hole assembly 14.Drill bit 30 can be rotated by various method (comprising such as pipeline 18 or MTR).In this exemplary, bottom hole assembly 14 comprises CPU (not shown) and em telemetry transmitter 32, described em telemetry transmitter 32 comprises and also senses via current emission device 16 except other operation of process bottom hole assembly 14, detects and the necessary electronic installation of transmission of electromagnetic signals, as in the art understand.
In some exemplary of electromagnetic remote metering system 10, electrically insulating material 34 is applied to one or more parts (pipeline 18 or bottom hole assembly 14) of drill string around to be applied to above current emission device 16 and/or below.In one embodiment, electrically insulating material 34 is without the need to being perfect insulator; On the contrary, the resistivity of electrically insulating material 34 is not less than two magnitudes higher than the fluid used during downhole operations (such as, drilling mud).In addition, in certain embodiments, electrically insulating material 34 also there is no need continuously along pipeline 18 or bottom hole assembly 14.But electrically insulating material 34 can be various material, for example, such as expandable material, injection moulding coating, ribbon, cover, stabilizing agent, hyperoxia fuel spraying coating, anodization layer etc.Described expandable material can be such as such as SwellTechnology
tMsystem, by assignee Halliburton Energy Services of the present invention, the material that Co. or Houston, Texas are commercially available.In addition, can select described expandable material, make once contact with drilling mud based on mud type (such as, oil base or water base), described expandable material to expand in bottom hole assembly 14 and/or pipeline 18 and is adhered to it.
As described previously, electrically insulating material 34 puts on one or more parts (that is, pipeline 18 or bottom hole assembly 14) of well post around to be applied to above current emission device 16 and/or below.In one embodiment, electrically insulating material 34 is immediately follows applied to above current emission device 16 and/or below, as shown in Figure 1A and 1B.But, in other embodiments, all electrically insulating material 34 can also be placed along pipeline 18 as requested.In some exemplary, electrically insulating material 34 can be applied for along with it enters the adhesive tape being wrapped in one or more portion of bottom hole assembly 14 in well 22.Described electrical insulating tape can by getting wet with by the same fluid being used for causing it to expand (such as, drilling mud) and bond along well post.But, in other embodiments, adhesive backing can also be utilized on adhesive tape to be adhered to well post.Exemplary insulated adhesive tape can be such as expandable material, adhesive backing rubber, silicone rubber, Teflon, mylar, poly-acid imide adhesive tape, polymer flake (such as, tygon).But in certain embodiments, poly use will be limited to about 115 DEG C, this is because the Typical melting points of vinyon is about 120 DEG C.In addition, described adhesive tape can 1 foot to several feet wide and fraction of an inch cun thick (such as, 1/8 inch).
In an alternate embodiment, electrically insulating material 34 can be formed into interior diameter and is a bit larger tham in the cover of hermaphrodite connector overall diameter of bottom hole assembly 14 or pipeline 18.In an example, insulating sleeve of electric will enter in well 22 along with it and apply along well post.Insulating sleeve of electric (for example, such as by applying fixture or adhesive tape so that insulating sleeve of electric is remained on original position until expandable material starts to expand) can remain on original position during disposing in every way.Or insulating sleeve of electric can be arranged in well post portion so that self is remained on original position enough compactly until expansion starts.In addition, the part of insulating sleeve of electric can be got wet with drilling mud, therefore causes the demi-inflation of described cover and is adhered to well post.But after deployment, along with insulating sleeve of electric contacts with drilling mud, described expandable material then by the superficial expansion activating against bottom hole assembly 14 or pipeline 18, is therefore adhered to it.Such as, based on expandable material described in the type selecting of the drilling mud utilized, can should be appreciated that as having benefited from personnel art of the present disclosure.
In addition, still with reference to Figure 1A and 1B, electrically insulating material 34 can also use in method described herein any one put on one or more sections of pipeline 18.This embodiment will be minimized in the current loss during launching along pipeline 18.In prior art telemetry system, above well post and sleeve pipe, the electric current of movement is tending towards moving out of well post/sleeve pipe and proceeding to ground, therefore causes the loss of signal.But, the use of this alternate embodiment of the present invention insulated above current emission device 16 by one or more parts of wherein pipeline 18, the magnitude of current proceeding to ground along pipeline 18 then reduces, it increases towards travelling backwards above well post and arrives the magnitude of current on earth's surface, therefore causes comparatively large amplitude signal.In certain embodiments, can only along bottom hole assembly 14, only along pipeline 18 or utilize electrically insulating material 34 along both bottom hole assembly 14 and pipeline 18 in combination.
In addition, in another alternate embodiment, resistance fluid can be drawn in well 22 to assist electric isolution electromagnetic remote metering system and sleeve pipe 22.This fluid can be drilling mud and/or the fluid additive adding described fluid to.In another embodiment, can when without electrically insulating material 34 utilize described resistance fluid, should be appreciated that as having benefited from personnel art of the present disclosure.
Although not shown in Figure 1A and 1B, exemplary of the present invention can also be used for the downlink telemetry system that only can utilize underground receiver.As in the art understand, electromagnetic remote metering system 10 can comprise receiver for receiving the signal launched from earth's surface via pipeline 18 but not current emission device 16.This embodiment or can not comprise em telemetry transmitter 32.In these embodiments, described receiver can be such as insulating short section assembly as described earlier or toroid winding.But, different from previous example described herein, described receiver will alternatively receive and decoded signal so as bottom hole assembly 14 in execution certain operations.In these embodiments, placing electrically insulating materials 34 at the one or more portion of pipeline 18 will reduce and/or eliminate from pipeline 18 to the current leakage sleeve pipe 20 or open hole stratum, should be appreciated that as having benefited from personnel art of the present disclosure.
Refer now to the chart of Fig. 2 A-2C, existing be described in above current emission device 16 and/or signal that electrically insulating material 34 is added in below improves effect.Described graph making, along electric current on the pipeline 18 and sleeve pipe 20 of the different depth of well 22, has wherein applied the electrically insulating material 34 of different length.Fig. 2 A be have 2,500 feet of drilling rods, 2,500 feet of sleeve pipes, 1 inch of insulating short section assembly, 1400 feet dark and use the figure of the pipeline 18 in 2,800 feet of wells of 0.25 ohm meter mud and the electric current on sleeve pipe 20.As visible, electric current is to make most of electric current no longer can be used as signal but alternatively quickly to be escaped into sleeve pipe 20 from drilling rod by the mode of sleeve pipe 20 short circuit effectively.
Fig. 2 B is in the well identical with Fig. 2 A but below 1 inch of insulating short section assembly, has the figure of the electric current on the pipeline 18 of 400 feet of electrically insulating materials 34 and sleeve pipe 20 along bottom hole assembly 14.Mud resistivity is also 0.25 ohm meter.As shown, only otherwise there is electrically insulating material 34, electric current still can escape into sleeve pipe 20 rapidly, but total signal level is able to remarkable improvement.Fig. 2 C is the another figure of the electric current along described well, but described well has 400 feet of insulators and have 400 feet of insulators below 1 inch of insulating short section assembly above 1 inch of insulating short section assembly.Mud resistivity is also 0.25 ohm meter.As aforementioned, electric current leaks into rapidly as electrically insulating material 34 stops the sleeve pipe 20 of part, but total signal level is also improved.Following figure Table I is the general introduction of these and other signal level that can observe at earth's surface place.
Figure Table I
As shown, in first row, there is the signal level in units of millivolt, occur the signal level being expressed as decibel millivolts in a second column, in the 3rd row, occur mud resistivity, and occur the general introduction of insulator in the 4th row.Although previous examples discussion utilizes the embodiment of transmitter, the snr gain of identical type utilizes in the embodiment of underground receiver by coming across, and should be appreciated that as having benefited from personnel art of the present disclosure.
In view of aforementioned, electrically insulating material 34 can variously put on well post.Such as, electrically insulating material 34 can make along with well post the one or more parts putting on well post.Or one or more parts of well post can insulate before well post is made.In addition, exemplary of the present invention may be used for open hole and cased well.In the sleeve section of well, electrically insulating material 34 reduces or prevents from current emission device 16 to the short circuit sleeve pipe 20.In the cutout portion of well, electrically insulating material 34 reduces or prevents from well post to the current leakage stratum.Therefore, the aboveground or downhole telemetry scope increase of electromagnetic remote metering system 10 reaches the distance of the length equaling applied insulator haply and down-hole power requires to reduce.Therefore, effectively provide em telemetry, simultaneously with within sleeve pipe and outside telemetry transmitter carry out drilling well (or perform other operation).
In addition, in the embodiment of the present invention utilized in cased well, the part of the well post of current emission device 16 (or receiver) below can insulate.But in the embodiment that the well part open along formation utilizes, the part of the well post of current emission device 16 (or receiver) top can insulate.In a rear embodiment, the length of one or more current-carrying parts on the stratum along open hole can be determined, and the length of length determination electrically insulating material 34 based on conductive formation.As in the art understand, can based on the position of the resistivity logging determination conductive formation of other well in such as building near well, should be appreciated that as having benefited from personnel art of the present disclosure.Based on the data recorded and plan well track and will how far exceed conductive formation (in the embodiment of drill string) at drill bit sometime, the identical skilled person of art easily can determine the length at the necessary conductive material of current emission device 16 (or receiver) top applying.Such as, if well is perpendicular hole and plan drill bit run expands to 12, the degree of depth of 000 foot, so electromagnetic launcher 200 feet of places above drill bit, and the stratum of very easily conducting electricity is from 10,000 foot expands to 11,000 foot, then 1, the electrically insulating material 34 of 800 feet can be positioned to make above current emission device 16 once current emission device 16 through the bottom of conductive formation (namely, once it is more than 11, the degree of depth of 000 foot), so will there is electrically insulating material 34 all the time between pipeline 18 and stratum.But, in arbitrary embodiment, above current emission device 16 or receiver (not shown) and/or one or more parts of the well post of below also can insulate.
Illustrative methods of the present invention provides a kind of for utilizing the method for electromagnetic remote metering system in the well of down-hole, described method comprises: provide the well post comprising the one or more pipelines being attached to bottom hole assembly, and described bottom hole assembly comprises at least one in current emission device or receiver; Electrically insulating material is applied at one or more portion of described well post; By described bottom hole deployment of components in described well; Described bottom hole assembly is used to carry out em telemetry operation; With utilize described electrically insulating material to reduce at least one in following item: from described current emission device to the short circuit of sleeve pipe; Or from described well post to the current leakage on described sleeve pipe or the stratum along described well.The described em telemetry operation carried out can be such as along described systems radiate and/or receiving electromagnetic signals.One or more portion that other method is also included in described well post apply described electrically insulating material with immediately preceding above or below described current emission device or receiver.In other method, apply described electrically insulating material at one or more portion of described well post and comprise the one or more parts being wound around described well post with one or more thin slices of electrically insulating material.
In another method, apply at one or more portion of described well post one or more portion location insulation sleeve that described electrically insulating material is included in described well post, described insulation sleeve is made up of electrical isolation expandable material.In other method, apply described electrically insulating material at one or more portion of described well post and comprise at least one that apply in following item: electrical isolation expandable material; Electrical isolation injection moulding coating; Electrical isolation spraying coating; Or electrical isolation anodization layer.In another method, apply described electrically insulating material at one or more portion of described well post and comprise: the length determining the current-carrying part on the stratum along described well; Described electrically insulating material is applied with based on the described length determined.
Exemplary of the present invention provides a kind of electromagnetic remote metering system for down-hole well, described system comprises: well post, it comprises the one or more pipelines being attached to bottom hole assembly, and described bottom hole assembly comprises at least one in current emission device or receiver; And electrically insulating material, its one or more portion being positioned at described well post are to reduce at least one in following item: from described current emission device to the short circuit of sleeve pipe; Or from described well post to the current leakage on described sleeve pipe or the stratum along described well.In another solid yardage case, described electrically insulating material is immediately follows positioned at above or below described current emission device or receiver.In yet another embodiment, described current emission device is insulating short section assembly or toroid winding.In another embodiment, described receiver is insulating short section assembly or toroid winding.In another embodiment, described electrically insulating material is one or more thin slices of electrically insulating material.In yet another embodiment, described electrically insulating material is insulation sleeve.In another embodiment, described electrically insulating material is at least one in following item: electrical isolation expandable material; Electrical isolation injection moulding coating; Electrical isolation spraying coating; Or electrical isolation anodization layer.
Another illustrative methods of the present invention provides a kind of for utilizing the method for electromagnetic remote metering system in the well of down-hole, described method comprises: apply electrically insulating material at one or more portion of well post, described well post comprises at least one in current emission device or receiver; Described well post is deployed in described well; With utilize described electrically insulating material to reduce at least one in following item: from described current emission device to the short circuit of sleeve pipe; Or from described well post to the current leakage on described sleeve pipe or the stratum along described well.One or more portion that other method is also included in described well post apply described electrically insulating material with immediately preceding above or below described current emission device or receiver.In other method, apply described electrically insulating material at one or more portion of described well post and comprise at least one that apply in following item: electrical isolation expandable material; Electrical isolation injection moulding coating; Electrical isolation spraying coating; Or electrical isolation anodization layer.In another method, apply described electrically insulating material at one or more portion of described well post and comprise: the length determining the current-carrying part on the stratum along described well; Described electrically insulating material is applied with based on the described length determined.
Above openly can in various example repeat reference numerals and/or letter.This be recycled and reused for easy and clearly object and self do not specify various discussed embodiment and/or configuration between relation.In addition, space relative terms (such as " below ", " below ", D score, " top ", " on " etc.) can in this article for ease of describing relation for describing an element or feature and another element or feature, as shown in FIG..Space relative terms is intended to except containing the orientation described in figure, and the difference also containing equipment is in use or operation directed.Such as, if equipment upset in figure, be so described as other element or feature " below " or " below " element will be oriented in described in other element or feature " top ".Therefore, exemplary term " below " can contain above and below two orientations.Described equipment can otherwise directed (half-twist or directed with other) and therefore can relatively describe in similarly decipher space used herein.
Although illustrated and described various embodiment and method, the invention is not restricted to these embodiments and method and should be understood to include as by having benefited from the apparent all modifications of personnel and change art of the present disclosure.Such as, one or more repeater can also form the part of telemetry system described herein, and in these cases, identical inventive principle will be applicable, as have benefited from art of the present disclosure identical personnel should be appreciated that.Therefore, should be appreciated that, the present invention is also not intended to be limited to particular forms disclosed.On the contrary, all modifications, equivalent and the substitute that will contain in the spirit and scope of the present invention that drop on as defined by the appended claims of the present invention.
Claims (17)
1., for utilizing a method for electromagnetic remote metering system in the well of down-hole, described method comprises:
There is provided the well post comprising the one or more pipelines being attached to bottom hole assembly, described bottom hole assembly comprises at least one in current emission device or receiver;
Electrically insulating material is applied at one or more portion of described well post;
By described bottom hole deployment of components in described well;
Described bottom hole assembly is used to carry out em telemetry operation; With
Utilize described electrically insulating material to reduce at least one in following item:
From described current emission device to the short circuit of sleeve pipe; Or
From described well post to the current leakage on described sleeve pipe or the stratum along described well.
2. method according to claim 1, its one or more portion being also included in described well post apply described electrically insulating material with immediately preceding above or below described current emission device or receiver.
3. method according to claim 1, wherein applies described electrically insulating material at described one or more portion of described well post and comprises the described one or more part being wound around described well post with one or more thin slices of electrically insulating material.
4. method according to claim 1, wherein apply at described one or more portion of described well post described one or more portion location insulation sleeve that described electrically insulating material is included in described well post, described insulation sleeve is made up of electrical isolation expandable material.
5. method according to claim 1, wherein applies described electrically insulating material at described one or more portion of described well post and comprises at least one that apply in following item:
Electrical isolation expandable material;
Electrical isolation injection moulding coating;
Electrical isolation spraying coating; Or
Electrical isolation anodization layer.
6. method according to claim 1, wherein applies described electrically insulating material at described one or more portion of described well post and comprises:
Determine the length of the current-carrying part on the described stratum along described well; With
Described electrically insulating material is applied based on the described length determined.
7., for an electromagnetic remote metering system for down-hole well, described system comprises:
Well post, it comprises the one or more pipelines being attached to bottom hole assembly, and described bottom hole assembly comprises at least one in current emission device or receiver; With
Electrically insulating material, its one or more portion being positioned at described well post are to reduce at least one in following item:
From described current emission device to the short circuit of sleeve pipe; Or
From described well post to the current leakage on described sleeve pipe or the stratum along described well.
8. system according to claim 7, wherein said electrically insulating material is immediately follows positioned at above or below described current emission device or receiver.
9. system according to claim 7, wherein said current emission device is insulating short section assembly or toroid winding.
10. system according to claim 7, wherein said receiver is insulating short section assembly or toroid winding.
11. systems according to claim 7, wherein said electrically insulating material is one or more thin slices of electrically insulating material.
12. systems according to claim 7, wherein said electrically insulating material is insulation sleeve.
13. systems according to claim 7, wherein said electrically insulating material is at least one in following item:
Electrical isolation expandable material;
Electrical isolation injection moulding coating;
Electrical isolation spraying coating; Or
Electrical isolation anodization layer.
14. 1 kinds for utilizing the method for electromagnetic remote metering system in the well of down-hole, described method comprises:
Apply electrically insulating material at one or more portion of well post, described well post comprises at least one in current emission device or receiver;
Described well post is deployed in described well; With
Utilize described electrically insulating material to reduce at least one in following item:
From described current emission device to the short circuit of sleeve pipe; Or
From described well post to the current leakage on described sleeve pipe or the stratum along described well.
15. methods according to claim 14, its one or more portion being also included in described well post apply described electrically insulating material with immediately preceding above or below described current emission device or receiver.
16. methods according to claim 14, wherein apply described electrically insulating material at described one or more portion of described well post and comprise at least one that apply in following item:
Electrical isolation expandable material;
Electrical isolation injection moulding coating;
Electrical isolation spraying coating; Or
Electrical isolation anodization layer.
17. methods according to claim 14, wherein apply described electrically insulating material at described one or more portion of described well post and comprise:
Determine the length of the current-carrying part on the described stratum along described well; With
Described electrically insulating material is applied based on the described length determined.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2012/072080 WO2014105051A1 (en) | 2012-12-28 | 2012-12-28 | Downhole electromagnetic telemetry system utilizing electrically insulating material and related methods |
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| Publication Number | Publication Date |
|---|---|
| CN104937442A true CN104937442A (en) | 2015-09-23 |
| CN104937442B CN104937442B (en) | 2019-03-08 |
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| CN201280077739.1A Expired - Fee Related CN104937442B (en) | 2012-12-28 | 2012-12-28 | Utilize the downhole electromagnetic telemetry system and correlation technique of electrically insulating material |
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| Country | Link |
|---|---|
| US (1) | US20150315906A1 (en) |
| EP (1) | EP2914986A4 (en) |
| CN (1) | CN104937442B (en) |
| AU (1) | AU2012397852B2 (en) |
| BR (1) | BR112015013673B1 (en) |
| CA (1) | CA2890618C (en) |
| RU (1) | RU2612952C2 (en) |
| WO (1) | WO2014105051A1 (en) |
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| CN111396035A (en) * | 2020-03-04 | 2020-07-10 | 中国地质大学（武汉） | Method for identifying interface and resistivity of coal bed and surrounding rock based on electromagnetic measurement while drilling signal |
| CN111441760A (en) * | 2020-04-01 | 2020-07-24 | 华中科技大学 | Throwing and fishing type underground wireless transmission system, wireless charging equipment and method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015058359A1 (en) * | 2013-10-22 | 2015-04-30 | 信远达石油服务有限公司 | Drilling auxiliary system |
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- 2012-12-28 US US14/443,940 patent/US20150315906A1/en not_active Abandoned
- 2012-12-28 AU AU2012397852A patent/AU2012397852B2/en not_active Ceased
- 2012-12-28 EP EP12890762.3A patent/EP2914986A4/en not_active Withdrawn
- 2012-12-28 WO PCT/US2012/072080 patent/WO2014105051A1/en active Application Filing
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| CN111441760A (en) * | 2020-04-01 | 2020-07-24 | 华中科技大学 | Throwing and fishing type underground wireless transmission system, wireless charging equipment and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2890618C (en) | 2019-02-12 |
| EP2914986A1 (en) | 2015-09-09 |
| RU2015122721A (en) | 2017-02-06 |
| CA2890618A1 (en) | 2014-07-03 |
| EP2914986A4 (en) | 2016-09-21 |
| AU2012397852B2 (en) | 2017-04-13 |
| RU2612952C2 (en) | 2017-03-14 |
| US20150315906A1 (en) | 2015-11-05 |
| BR112015013673B1 (en) | 2021-08-10 |
| BR112015013673A2 (en) | 2017-07-11 |
| WO2014105051A1 (en) | 2014-07-03 |
| CN104937442B (en) | 2019-03-08 |
| AU2012397852A1 (en) | 2015-05-21 |
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